Documentation

Do not use on a live site!

This is intended for development only. It shows more about your site, gives you more info, and makes trivial errors fatal.
All of that is awesome if you want to debug quicker, and force high quality standards.

On a production server, that sucks, and is potentially unsafe.

In case you forget, you can disable this in production using the 'php_error.force_disabled' php.ini option (see below).